Improvement in cow-milkers



-L.o.0oLVIN.

COW MILKER.

No. 41,196. Patented Jan'. 12, 1864.

UNITED STATES PATENT OFFICE.

n L. O. COLVIN, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN" COW-MILKERS.

Specification forming part of Letters Patent No. 41,196, dated January l2, 1864.

To all whom, 'it may concern:

Be it known that I, L. O. COLVIN, of Philadelphia, in the county of Philadelphia and I,State of. Pennsylvania, have invented a new and Improved Device forI Milking-Cows; and *I do hereby declare that Athe following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this speciiication, in which-l Figure l is aside sectional view of my invention, taken in the line .fr w, Fig. 2; Fig. 2, aplan ontop view of the same; Fig. 3, a section of the same, taken in the line y y, Fig. 2.

Similar letters of .reference indicate corresponding parts in the several figures.

This invention relates to certain improvements on a cow-milking device for which Letters Patent were granted to nie'bearin g date May 22-and 29, 1860, and February 17, 1863.

The object of the present invention is toreducc the milking device to the simplest possible form, render it capable of heilig operated or manipulated with greater facility than here tofore, and also capable of having, when necessary or desired, two of the teat-tubes cut off from the suction-chamber, so as to leave only two of the teat tubes operative.

To enable those skilled inthe art to fully understand and construct my invention, I will proceed to describe it.

A represents a circular flat box or chamber, which may be termed a suction-chambe'rf7 and to which the four teat-tubes B B B B are attached. These teat-tubes maybe constructed and connected to the box A in the same way as described in my patent of February 17, 1863.A The`bottom Al of the box'A is composed of india-rubber, cloth, or other ilexible material, having a metal hoop, afin its edge of such diameter that it may be (itted snugly within the` box and retained in position by the elasticity of the hoop. .The other portion of the box A may be struck up or swaged out of sheet-metal, the top of the box being formed with grooves or channels b in its under side, which constitute milk channels or ducts leading to the teat-tubes B, and these grooves or channels communicate at their inner ends with an annular channel, c,which communicates with a passage, d, leading to a chamber, C, in which the piston D is fitted. (See Fig. 1.,)

The milk channels or ducts b c may .be

d in consequence of the vexternal'pressinfe forcing the elastic bottom A] ofgthel box-,A against the partition @,-fhenc'e were no means employed to 'obviate this the other two teattubes, B B, would only be operative. When, however, it is desired to milk the'four teats of a cow simultaneously, the elasticrbottom A! is kept free* from the partition .e by meanspf a metal plate, E, which .is `at-the inner side ot' the bottoml A', and is.provided with a lip,rf at one end. The plate E is attached to a shoi t` handle, g', at the outer side of the bottom A', and by pressing the handle g laterally the lip fot' the plate E will catch under the pa'r` tition e and force down..the bottom A so as to keep it, when a suction is formed in the box A, free from the partition e, as shown in red in Fig. 3. Thus by this simple arrange-l' nient two or the whole four of the teat-tubes may be rendered operative, and two or four' teats ofthe cow milked simultaneously,as de'- "sired. The chamber C is of conical form and is attached to the box A in an oblique position, as shown in Fig. l. The plungerv or pis-. ton D is constructed of india-rubber, cloth, or any suitable elastic material, so as to conform to the shape of the interior of 0, and serve, when forced `inward,as a valve to cover the inner oritice of a tube, G, which communif cates with (l and is an eduction-tube, and also serves as ahandle for the device.' The plunger or piston D has circulardisksh hfattached to its inner and outer sides,-4 and albar, H, which serves as a handle to operate the 'plunger' or piston, D', is attached tosaidplatesl by a bolt, i.

I is a valve which covers the oriceof .the passage d at it junction with- G-s- This-valve I opens outward or into C, as shown in red-in Fig. l. h

The operauon 1s as follows: The implement is held in the left hand by grasping the han dle and tube G, and the plunger or piston D is operated through the mediumot thefhandle H, which is worked back andiorth with the.

.loweredges ofthe" disks h h in contact with G. As the plunger or piston D is drawn outward, the valve I opens, and a suction is produced in the box A, as Well as in the teat ltubes, two or all of the latter being operative -and discharged into the pail or receptacle prepared to receive it, placed underneath the outer end of Gr.

The plunger or piston D has a metal hoop or wire,j, at its outer edge which is fitted snugly in theouter end of G, bearing against a shoulder, k, therein, the elasticity ofj keeping the plunger or piston in proper position. Ity will be seen that the elastic bottom A of the box A, as well as the plunger or-piston'D, may be readily removed or. detached at -any time and all the internal parts ot' the device rendered accessible for cleansing.

The working of the plunger or piston will, in consequence of the device being held with one hand, give a gentle up-and-down movement to the device, which greatly aidsl in the abstraction of the milk from the cow, while the suction or draw of the device, although not strictly constant, is sufficiently so to prevent the teat-tubes becoming casually' loosened from the teats.

rlhe device is under thecomplctc control of the operator.

Having thus described my invention, what I claim as new, and desire to secure b'y Letters Patent, is-

1. lhe elastic bottom A', applied to the box vor suction chamber A, in connection with .thc

partition e in said box or chamber, the plate E, and the teat-tubes BIB B B', all arranged to operate in the manner substantially as and for the purpose herein set forth.

2. The chamber C, provided with the'elastic plunger'or piston D, arranged relatively with the tube Gr, as shown, so as to perform the double function of a plunger and valve, Substantially as set forth.

3. The combination and arrangement of the box A, chamber C, and tube G with the valve I and mat-tubes B B B B,to form a new and improved device, for the purpose specified.

L. O. GOLVIN.

Witnesses:

Trios.' L. J. DOUGLAS,d GEO. W. REED. 

